<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>


<div class="test1">

    <p>
        <span class="test2">

    </span>
    </p>
</div>


<script >
    const test1 = document.querySelectorAll(".test1")[0];
    const span = test1.querySelectorAll("div.test1 span");

    console.log("test1:", test1,);
    console.log("span:", span); // 仍可以选中span BUG


</script>
</body>
</html>